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Pressure switch

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Bud

12-31-2000 16:31:13




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I have gone through two pressure switches on my submergible water pump in the last three months. Contacts are sticking together (Look like they have arced)These switches should last several years. Water tank is not water logged. Have had no lightning strike. Pump is not constantly recycleing. Could there be a electrical problem? Any suggestions?




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Tom R

01-01-2001 06:44:30




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 Re: Pressure switch in reply to Bud, 12-31-2000 16:31:13  
It has been a while since I have worked on a submersible pump, but if memory serves me correctly there usually two types. The older style were 3 wire systems where the wires coming from the control box to the pump had one wire for the run winding, one wire for the start winding and a common that was shared by both the start and run winding. The control box has a start capacitor and either a current relay or potential relay that switches out the start winding when the pump has come up to speed. If you have this type the problem could be in the control box with either the switching relay or the capacitor. The newer style (especially on 1/2 hp and smaller is the 2 wire system with no control box, these have a permanent split capacitive start/run motor and the capacitor is in the pump body. If the start circuit is faulty on this type you must pull the pump.

As others have indicated you need to do a current check. In my opinion you need to use a clamp on ampmeter to check the current draw of the motor on start, note if the current drops off rapidly as the motor comes to speed. If it is the 3-wire type you also need to check the current draw on the start windings this current should drop to zero as the start winding switches out.
Hope this helps Tom R

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Larry Again

01-01-2001 06:00:21




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 Re: Pressure switch in reply to Bud, 12-31-2000 16:31:13  
These other guys may be right. However, the system I have is like this...the pressure switch is simply a signaling device for the control box, that actually turns the pump on and off--is yours like that?? If so, I wonder if its possible that you've got a control problem. I'd guess that if your pump was drawing excessive current, then you'd have a problem in the contol box. If you could check it with a VOM and see how much its drawing, that might give you a good idea. I'd still bet its something basically simple, like a very small split or hole in the line, or a bad check valve. This is a heck of a time of year for water troubles!! Its below zero here, and it always seems like thats when I have trouble with something like water pumps. Let us know what it turns out to be.

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Larry

01-01-2001 05:49:37




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 Re: Pressure switch in reply to Bud, 12-31-2000 16:31:13  
I'm betting its a leak somewhere in the system. Does the pressure guage show a drop in pressure between the recycling of of the pump? My guess is this, if the pump is kicking on and off as much as you say, then you're simply burning the points up. I don't really know much about submergible pumps, but I've had similiar problems with Jucuzzi pumps (not submergible), it will happen when you've got a bad foot value, or a hole in a line. If the hole in the line is in the well, you'd never really know it unless you could look in and see it, or hear water leaking. I'm guessing that there is a check valve between the pump and the line running to the system....anyway, if you were losing pressure anywhere, and the tank isn't water logged, then that would explain the constant recycling. Let us know what you find out, I'm curious. Good Luck with it.

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T_Bone

12-31-2000 20:07:42




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 Re: Pressure switch in reply to Bud, 12-31-2000 16:31:13  
Hi Bud, Sounds like your at pump pulling and replacement time. Either the pump or the pump motor is shot. You can confirm which it is with an VOM and amp meter. As lft said your getting excessive current draw and it will continue until something smokes.

T_Bone



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ltf in nc

12-31-2000 18:25:36




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 Re: Pressure switch in reply to Bud, 12-31-2000 16:31:13  
Something is causing the current draw to be excessive. The wire going down to the pump could have worn the insulation off against the well casing. You need to check the current draw and compare it to the pump specs. Good luck



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